The 2024 City Nature Challenge will take place on April 26th to April 29th, 2024 and will be undertaken in over 500 cities across the world and Indianapolis and Fort Wayne are among those cities competing in this international event!

The City Nature Challenge is an effort for cities to find and document as much urban nature as possible by challenging residents to become citizen scientists: Residents are asked to explore their area (backyard, playgrounds, parks, etc.) for plants and bugs/animals, document their findings (take a photo), and report them (via the iNaturalist website or app). The underlying objective of this event is to develop a new baseline of a city’s biodiversity and to monitor how exactly change is accelerating.


Event size is tracked via the event pages below, so please sign-up!

Anywhere in Indiana!

Statewide Project:



Fort Wayne:



Terre Haute:

This event is one of the largest citizen science events in Hoosier history, so join the fun and help make history!


Garfield Park – Indy Free Tree Day

Friday, April 26th from 11:00 AM to 1:00 PM

Visit the Garfield Park Burrello Family Center on Friday, April 26, 2024, from 11:00 AM-1:00 PM to receive a free tree in honor of Arbor Day!

Indiana State MuseumEco Science Day

Friday, April 26th from 11:00 AM to 4:00 PM

The Eco-Science Challenge encourages innovative Hoosier students to work towards finding solutions to current eco-science issues. Both small and big initiatives are welcome as we work together to positively impact our communities and beyond.


The Indianapolis City Nature Challenge is organized by un-paid volunteers and fiscally sponsored by the 501(c)3 non-profit Indiana Sciences. If you would like to support this effort, please consider donating at the link below:


If you enjoy events like the City Nature Challenge and would like to join our movement, please consider signing up on the form below to stay up to date and, if you are ambitious, join our team!


You can also support the event by purchasing merch from the shop! We currently have the locally designed “Science Will Unite Us” tees from United State of Indiana! All proceeds go to support our STEM events and programming throughout Indiana!


This event, and everything we do, is only possible due to the amazing support and generosity of Hoosiers passionate about science.  From the bottom of our hearts: Thank you!